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3 sheets -snin 1.

G. CHURCH. GIRGULAR SLIDE VALVE.

(No Model.)

No. 316,236. Patented Apr. 21., 1885;

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CIRCULAR SLIDE VALVE. I No. 316,236. Patented Apr. 21, 1885.

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(No Model.) 3 Sheets-Sheet 8. W.- O. CHURCH. I

CIRCULAR SLIDE VALVE.

Jul 11 UNTTER STATES PATENT @EFTQE.

WALTER OHARLEs Hu OH, OF BBIXTON, COUNTY OF suR ASSIGNOR To THE WALTERO. OHUROH ENGINEERING OOMPANY, (LIMITEDQ OF LONDON, ENGLAND.

CIRCULAR SLIDE-VALVE.

SPECIPICA'IIbN forming part :of Letters Patent NO. 316,236, dated April21, 1885.

Application filed June 10,1884. (No model.) Patented in England Jariuary 31, isse,No. 47s; in France July 26,1882,1N0.150,32l;

in Belgium July 29. 188i1,-N0. 58,616, in Germany July 30, 1882, No.21,544, and inAustria October 11,1882, No. 1,896.

.To all whom it may concern.-

Be it known that I, WALTER GHARLEs CHURCH, a citizen of England,residing at Brixton, in the county of Surrey, England, have invented anew and useful Improvement in Circular Slide-Valves and the Ports andCases thereof, (for which I have obtained patents in Great Britain, No.476, dated'January 31, 1882; in France, dated July 26, 1882, No.150,321; in Belgium, dated July 29, 1882, No. 58,616; in Germany, datedJ uly 30, 1882, N0. 21, 544., and in Austria, dated October 11, 1882,NO. 1,896,) of which the following is a specification.

In the specification accompanying my application for Letters Patent ofeven date herewith I describe means of causing circular slidevalves toturn round within the loop or eye of the slide-rod which moves them toand fro, so as to insure equality of wear of the rubbing-surfaces. Mypresent invention relates to the construction of such circular slidesand the ports and cases thereof, so as to relieve a great part of thepressure on them, to provide against their edges catching against theedges of the ports, and to prevent the deformation of the cylinders towhich they are applied by the pressure within the slide-case, as I willexplain, referring to the accompanying drawings.

Figure 1 is a longitudinal section, and Fig. 2 a transverse section, ofpart of a cylinder, with a circular slide and its case, according to myinvention. Fig. 3 is a plan showing the ports governed by the circularslide. Fig. 4 is a plan of the central bearing-piece for relievingpressure on the slide. Fig. 5 is a plan, and Fig. 6 is a side view, ofthe slide and the loop or eye of the slide-rod which embraces it. Fig. 7is a longitudinal section showing a modified arrangement for keeping theslide against the cylinder-face. Fig. 8 is a longitudinal sectionshowing a modified form of tie for the case of a large slide. Fig. 9 isa plan-showing the ports governed by the slide. Fig. 10 is a. plan ofthe central bearing-piece for relieving pressure on the slide. Fig. 11is a plan, and Fig. 12 a side view, of the slide and the loop or eye ofthe slide-rod.

In all the figures similar parts are marked by similarreference-letters.

AIA are th'e'crescent-shaped ports, over which the slide travels. Inorder tosupport theedges of the slide as they move over the ports, andto prevent them from deflecting, so

as to catch against the edges of the ports, I introduce in each port acentral rib, a,'as

erable part of the pressure forcing it against the cylinder-face, Iprovidea central bearingpiece, B, projecting up from the cylinder andspreading out in mushroom form, presenting on its upper face a surface,on which works a facing within the back of the slide S. The piece B hasits upper surface made with. a somewhat elliptically-shaped hollow, b,with two central side parts of the surface at b b, widened out, as shownin Figs.4 and 10, to present greater surface where the rubbing is mostconstant, and thus insure greater uniformity of wear. The bearing-pieceB is bolted to the side of the cylinder, engaging under it, as

shown in Figs. 1, 2, and 7, the head of a strong bolt, 0, which extendsup through a central hole of the slide and through a hole in the coverof the slide-case, on which is screwed a nut, c. The bolt 0 acts as atie, connecting the cover of the slide to the cylinder, so that thedownward pressure within the slide case, which tends to deform thecylinder by press ing it inward, is counteracted by the upward pressureon the cover of the slide-case.

Instead of a single bolt 0, several such bolts may be employed; or thebearing-piece B may be made with a tubular part, B, extending upwardandbolted to the cover of the slide-case,

the periphery of the slide, causing it to turn a little round, always inthe samedirection at every reciprocation. As shown in Figs. 1, 2, and 8,I form in the surfaces D grooves d, into which enter the sides of theloop or eye F, portions of which are made straight, so that the loop oreye being thus guided is prevented from exerting any twisting action onthe slide in case external parts of the slide-rod B should be subjectedto torsive strain. As shown in Figs. 5 and 6, I connect the pins of therollers E E by a spring-guard, G, which presses on the middle of theback of the slide, keeping it steadily bearing against thecylinder-face. This guard is made with a slotted hole, 9, to clear bolt0 as the slide reciprocates.

As shown in Fig. 7, instead of the springguard G, a disk, G, is fittedon the bolt 0, this disk being pressed down by a helical springadjustable by a nut, 0. As shown in Figs. 11,

and 12, the spring-guard G is bolted to the} loop or eye F where therods R join it, and is i made with an elongated hole, g sufficientlylarge to clear the tubular tie B. 4 Having thus described the nature ofmy invention and the best means I know of carrying it into practicaloperation, I herebyde-i .forth.

3. The slotted disk G, in combination with the helical spring and theadj usting-nut C on the central tie-bolt,C, for the purpose of holdingthe slide down on its facing, substantially as described.

In testimony whereof I have signed my .name to this specification, inthe presence of two subscribing witnesses, this 6th day of May, A.D1884.

O. CHURCH. Witnesses:

JNo. P. M. MILLARD, J. WATT.

